Apparatus for controlling parts of machinery.



V. REMBOLD.

APPARATUSFOR CONTROLLING PARTS OF MACHINERY.

APPLICATION FILED FEB- 19, I914.

wmm. Patented June 20,1916.

2 $HEETS-SHEET I- yqmw SM? V. REMBOLD.

APPARATUS FOR CONTROLLING PARTS OF MACHINERY.

APPLICATION FILED FEB. 19. 1914.

1 9 1 @Yfifil Patented June 20, 1916.

2 SHEETS-SHEET 2- WED @TATESi AEW UFFTE.

VICTOR REMIBOLD, OF KIEL, GERMANY, ASSIGNOR T0 FRIED. KRUP]? AKTIENGESELL- SCHAFT GEBMANIAWERFT, 0F KIEL-GAARDEN, GERMANY.

Specification of Letters Patent.

Patented June 2d, 1916..

Application filed February 19, 1914. Serial No. 819,781.

To all whom it may concern Be it known that I, VICTOR RnMnoLi), a citizen of the German Empire, residing at Kiel, Germany, have invented certain new and useful Improvements in Apparatus for Controlling Parts of Machinery, of which the following is a specification.

This invention relates to apparatus for developing definite reciprocating movements useful for many purposes, such for instance as controlling parts of machinery, an illustrative example of which may be seen in U. S. Letters Patent No. 991,029, granted May 2nd, 1911, to J. A. Scott; and particularly to that class of such apparatus in which the piston rod of a piston moved in a controlling cylinder by a pressure medium, effects the adjustment in thetwo end positions, and the object of the invention is to provide such a controlling mechanism which permits of adjustment of the part to be controlled in more than two positions. Such an adjustment in several positions is necesfor example in the case of reversing gears for steam or internal combustion engines, the valve cam shaft of which must be capable of being adjusted to forward running, rest and backward running.

The invention will be fully described with reference to the accompanying drawings, in which,

Figures 1 to 3 are sectional views of the parts of a controlling device constructed according to this invention, Fig. 1 showing the starting or home position, Fig. 2, an intermediate position and Fig. 3 the extreme end position of a working piston or the slidable part of the machine while in a Second em bodiment Fig. i shows a controlling device which permits of four settings.

The constructional example shown in Figs. 1 to 3 will be described first.

A is the main pressure medium cylinder and B is the main piston, the blunt ended piston rod 6 of which carries a cross head G. To the pins 0 of the cross head C is attached a frame-like rod arrangement D D-, which leads to the part of the machinery to be controlled. Between the connecting rods D, there is provided according to this invention, a second pressure medium cylinder E, which is coaxial with the cylinder A and is ri idlvconnected thereto b a frame t3.

G. This auxiliary cylinder E is of such a length as to allow a piston therein to havea stroke of only half the length of that of the piston B in the cylinder A, but is of somewhat greater diameter than the said cylinder A. In the auxiliary cylinder E works a freely floating piston F, the piston rod f of which terminates, precisely like the piston rod Z2 in a blunt end.

Communicating with the upper and lower ends of the cylinder A are two pressure medium pipes H and J, which pass respectively through the lower and upper covers of the cylinder A, and entering the upper end of the cylinder E by passing through the top cover thereof is a pressure medium pipe K. All three pressure medium pipes lead to a valve L, here shown hand operated, which is connected to a pressure medium supply pipe M and a pressure medium exhaust pipe N,

and the construction of which valve L, (not further illustrated in the drawing) is so arranged, that according to the adjustment of a rotary valve member adapted to be operated by a crank Z the pipes H J K can be connected with the supply or exhaust pipe for the pressure medium, to correspond to the particular requirements of the control to be more fully described hereinafter.

The action of the controlling device is as follows: In Fig. 1 the main piston B and therefore also the connecting rods D are set in the lowest or home position, and the valve L Z is so set that the space in the cylinder above the piston 13 of the main cylinder A, is in communication through the pipe J with the pressure medium supply M,while the space beneath the piston B and the space above the piston F of the auxiliary cylinder, are in communication with the pressure medium exhaust port N. When the piston B is in this position, the connecting rods assume the lowermost or home position. To change from this home position into the middle controlling position shown in Fig. 2, it suiiices to rotate the crank Z of the valve L one-fourth of a revolution, whereby the pipes H and K are put under pressure from M, and the pipe J put into communication with the exhaust port N. The result of this is that the piston B of the main cylinder A moves upward, until its piston rod 6 strikes against the end of the piston rod f of the piston F in the auxiliary cylinder-E,

which piston F assumes its lowest position of. pressure is adjusted.

To change into the upper extreme position (Fig. 3), a further quarter rotation of the 'crankZ of the valve L Z isnecessary, whereby-the pipe K is 'now put into communication with the pressure medium exhaust port N, while no change in the existing connection takes place in respect of the pipes Hand J. As by this means thepressure in the auxiliary cylinder E disappears, the piston B of the main cylinder A is now able to continue its course upward, pushing in front vof it as itdoes so the piston F of the auxiliary cylinder E. By the further rotation of the crank Z through half a revolution,

the controlling apparatus can be returned to the original position shown in Fig. 1, whereby the possibility of direct reversal from one extreme position to the other is afi'orded. Instead of this, the crank Z may naturally be rotated backward, in which case the three positions (see Fig. 3, Fig. '2, Fig. 1 respec- ,tively) of the connecting rods or the main piston are passed through in the reverse order. A safety valve P isprov ded whlch j blowsoit when a fixed pressure isexceeded, "'35 inorder that pressure may .not rise to an impermisslble degree 1n the cylinder A when changing the controlling device from the position shownjin Fig. 3 to that shown. in

"thrust back the I of the stroke; P

Fig. 2, during which the piston F has to piston' B by half-the length j The embodiment illustrated in Fig. 4:, is intended toshow-that, with the aid of the invention,;it is possible to. set the connecting rods in fourdiflerent positions instead of three; For this purpose there is provided, in addition to the auxiliary cylinder '15 a second auxiliary. cylinder R, which is placed below the main controlling cylinder A, and the freely floating piston S of which has a piston rod 8 which terminates in a blunt'end like thepiston rod f of the first auxiliary cylinder E. The said end of the "piston 'rod s cooperates' with a similarly formedlend on a second piston rodb of :thepiston B of the main cylinder. Inaddi- @tion; tothis, itwill also be necessary in this case to provide two pressure medium pipes Y LT and U which lead from thevalve "L to .the' lower end of the cylinder R and to the "upper end of the cylinder A respectively.

The positions of the controlling ipiston B,

i attainable by means. of the auxiliary pistons l'F and. S, are shown in Fig.

and'denoted by'I II, III and a V i.

4 bydotted lines inde said valve to that end of the auxiliary cyl To attain the relative positions of the parts as shown in Fig. 4 in full lines, that is, the starting position I of piston B, the crank Z must be in its home position, the valve sending pressure medium to cylinder A through pipe U, while the spaces beneath the pistons B and S and the space above the piston F are in communication with the pressure medium exhaust port N through pipes H T and K.

To hold the main piston B in position II, the crank Z is turned 90 from home position, whereby the pipe T is put under pres sure from M, and the pipes H, U and K put into communication with the exhaust port N.

To hold the main piston B in position III, the crank Z is turned 180 from home position, whereby the pipes H and K are put under pressure from M, and the pipes U and T put into communication with the exhaust port N.

To hold the piston B in position IV, the crank Z is turned 270 from home position, whereby the pipe H is now put under pressure from M, and the pipes U, K and T put. in communication with the exhaust port N.

I claim:

1. A device for controlling the length of stroke of a main piston, comprising :1 cylinder for said piston, an auxiliary cylinder with a floating piston in alinement with said main cylinder and piston, the auxiliary piston having greater pressure area, but shorter length of stroke than the maximum stroke of said main piston, and the cylinders having such relative positions that the respective piston rods may abut during the complete stroke of the auxiliary piston, but only duringpart of the maximum stroke of the main piston. v

2. A device for controlling the length of stroke of a main piston, comprising a cylinder for said piston, an auxiliary cylinder with a floating piston in alinement with said main cylinder and piston, the auxiliary piston having greater pressure area, but shorterlength of stroke than the maximum stroke of said main piston, and the cylinders having such relative positions that the respective piston rods may abut during the complete stroke of the auxiliary pisten, but only during part of the maximum stroke of the'main piston: a double acting valve having an intake and an exhaust port for pressure medium, conduits leading from said valve to each end of said main cyland a separate conduit leading from inder which is situated away from said main cylinder. 7

3. A device for controlling the length of stroke of a main piston, comprising a cylinder for said piston, an auxiliary cylinder with a floating piston inalinement withsaid main cylinder and piston, the auxiliary piston having greater pressure'area but shorter length-of stroke than themaximu-m stroke of said main piston, and the cylinders having such relative positions that the respective piston rods may abut during the complete stroke of the auxiliary piston, but only during part of the maximum stroke of the main piston; a double acting valve having an intake and an exhaust port for pressure medium, conduits leading from said valve to each end of saidmain cylinder and a separate conduit leading from said valve 'to that end of the auxiliary cylinder which'is situated away from said main cylinder, whereby, on setting said valve in a certain position, said auxiliary piston will be made to travel against said main piston, thus shortening the stroke of the main piston.

i. A device for controlling the length of stroke ofa main piston, comprising a cylinder for said piston, an auxiliary cylinder with a floating piston in alinement with said main cylinder and piston, the auxiliary piston having greater pressure area but shorter length of stroke than the maximum stroke of said mainpiston, and the cylinders having such relative positions that the respective piston rods may abut during the complete stroke of the auxiliary piston but only during partof the maximum stroke of the main piston; adoubleacting valve having an intake and an exhaust port for pressure medium, conduits leading from said valve to eachend of said main cylinder and a separate conduit leading from said valve to that end of the auxiliary cylinder which is situated away from said main cylinder whereby, on setting said valve in a certain position, said auxiliarypiston Will be made to travel in advance of said main piston permitting a full strokeof the latter.

5. A device for controlling the length of stroke of a main piston, comprising a cylinder for said piston, an auxiliary cylinder with a floating piston in alinement with said main cylinder and'piston, the auxiliary piston having greater pressure area but shorter length of stroke than the maximum stroke of said piston, and the cylinders having such relative positions that the respective piston rods may abut during the complete stroke of the auxiliary piston but only during part of the maximum stroke of the main piston; adouble acting valve having an intake and an exhaust port for pressure medium, conduits leading from said valve to each end of said main cylinder and a separate conduit leading from said valve to that end of the auxiliary cylinder which is situated away from-said maincylinder, whereby, on setting said valve in a certain position, said auxiliary piston will b'e made to travel against said main piston, thus shortening the stroke of the main piston; and, on setting said valve in another position, said auxiliary piston will be made to travel in advance of said main piston permitting a full strokeofthe latter.

6. A device for-controlling the length of stroke of a main piston, comprising a cylinder torsaid piston, a plurality of auxiliary cylinders with floating pistons in alinement with said main piston, the auxiliary pistons having greater pressure area but shorter length of stroke than the maximum stroke of said main piston; the cylinders having such relative positions that the rod of said main piston may abut against the piston rod of any one of said-auxiliary cylinders during the complete stroke of said auxiliary piston rod, but only during part of the "maximum stroke of the main piston.

7. A device for controlling the length of stroke of a main piston, comprising a cylinder for said piston, a plurality of auxiliary cylinders with floating pistonsin alinement with said main piston, the auxiliary piston-shaving greater pressure area but shorter length of stroke than the maximum stroke of said main piston; the cylinders having such relative positions that the rod of said main piston may abut against the piston rod of any one of said auxiliary cylinders during the complete stroke of said auxiliary piston rod, but only during part of themaximum stroke of the main piston; a double acting valve having an intake and an exhaust port for pressure medium, conduits leading from said valve to the respec .tive ends of said main cylinder and separate conduits leading from said valve to those ends of the respective auxiliary cylinders which are situated away from said main cylinder.

8. A device for controlling the length of stroke of a main piston, comprising a cylinder for said. piston, a pluralityof auxiliary cylinders with floating pistons in alinement with said main piston, the auxiliary pistons having greater pressure area but shorter length ofstroke than the maximum stroke of said main piston; the cylinders having such relative positions that the rod of said main piston may abut against the piston rod of any one of said auxiliary cylinders during the complete stroke of said auxiliary piston rod, but only during part of the maximum stroke of the main. piston; a double acting valve ha-vingan intake and an exhaust port for pressure medium, conduits leading from said valve to the respective ends of said main cylinder and separate conduits leading from said valve to those ends of the re spective auxiliary cylinders which are situated away from said'main cylinder, whereby, ion setting said valv'ein a certain position, one of said auxiliary pistons will be made to travel againstsaid main piston, thus shortening the stroke of themain piston.

9. A device for controlling the length of stroke of a main piston, comprising a cylinder for said piston, a plurality of auxiliary cylinders with floating pistons in alinement with said main piston, the auxiliary pistons having greater pressure area but shorter length of stroke than the maximum stroke of said main piston; the cylinders having such relative positions that the rod of said main piston mayabut against the piston rod of any one of said auxiliary cylinders during the complete stroke of said auxiliary piston rod, but only during part of the maximum stroke. of the main piston; a double acting valve havingan intake and an exhaust port for pressure medium, conduits leading from said valve to the respective ends of said main cylinder and separate conduits leading from said valve to those ends of the respective auxiliary cylinders which are siti uated away from said main cylinder, whereby, on setting said valve in a certain position one of said auxiliary pistons will be made to travel in advance-of said main pis: ton permitting a full stroke of the latter.

10. A device for controlling the length of stroke of a'main piston, comprising a cyl inder for said piston, a plurality of auxiliary ,cylinders with floating pistons in alinement with said main piston, the auxiliary pistons having greater'pressure area but shorter length of stroke than the maximum stroke of said main piston; the cylinders-having such relative positions that the rod of said main piston may abut against the piston rod of any one ofsaidauxiliary cylinders during the complete stroke of said auxiliary piston .ro dgbut only during part ofthe maximum strokecfthemain piston; a double acting valvehaving an' intake and an exhaust port for-j pressure medium, conduits leading from :said valve to the respective ends of said main cylinder and separate conduits leading from sa'id'valve to 'those ends of the 1 respective auxiliary cylinders which are sit- "uated'away tromsaid main cylinder, whereby, on setting said valvein a certain positionone-of saidauxiliary pistons will be made to travel against said main piston, thus shortening the stroke of the main piston,and on setting said valve in another pcsition,one-of said auxiliary pistons will be made totravel in advance of said main piston permitting a full stroke of the latter 1 ll A-device for automatically setting a sliding member in a plurality of positions,

comprising a main cylinder'havin'g a piston rigidly. attached to said sliding member, an auxiliary cylinder anda floating piston "therein; the cylinders being in alinementfthe auxiliary piston having greater pressure area but shorter length of'st'roke'than the complete stroke of 'said 'main piston, whererigidly attached to said sliding member, an

auxiliary cylinder and a floating piston therein; the cylinders being in alinement, the auxiliary piston having greater pressure area, but shorter length of stroke than the complete stroke of said main piston, whereby said main piston in its starting position will stand free from said auxiliary piston, but will abut against it in its intermediate position and its extreme end position, while said auxiliary piston has its foremost and rearmost positions respectively; a double acting valve having an intake and an ex haust port for pressure medium, conduits leading from said valve to the respective ends of said main cylinder, and a separate conduit leading from said valve to that end of the auxiliary cylinder which is situated away from said main cylinder.

.13. A device for automatically setting a a sliding member in a plurality of positions, comprising a main cylinder having a piston rigidly attached to said sliding member, an auxiliary cylinder and a floating piston therein; the cylinders being in alinement, the auxiliary piston having greater pressure area, but shorter length of stroke than the complete stroke of said main piston, whereby said' main piston in its starting position Will stand free from said auxiliary piston, but-will abut against it in its intermediate position and itsextreme end position, while said auxiliary piston has its foremost and rearmost positions respectively; a double acting valve having an intake and an. exhaust port for pressure medium, conduits leading from said valve to the respective ends of said main cylinder, and a separate conduit leading from said valve to that end of the auxiliary cylinder which is situated away fIOIIl'SfllCl main cylinder, whereby, on setting said valve in a certain position, said auxiliary piston. will be made to travel 7 against said main piston, thus shortening the by said main piston in its starting position will stand free from said auxiliary piston,

but will abut against it in its intermediate position and in its extreme end position while said auxiliary piston has its foremost and rearmost positions respectively, a pressure medium controlling valve having connections through which it may exhaust pressure medium from said auxiliary cylinder, whereby, on setting said valve in a certain position, said auxiliary piston will be made to travel in advance of said main piston permitting a full stroke of the latter.

15. A device for automatically setting a sliding member in a'plurality of positions, comprising a main cylinder having a piston rigidly attached to said sliding member, an auxiliary cylinder and a floating piston therein; the cylinders being in alinement, the auxiliary piston having greater pressure area, but shorter length of stroke than the complete stroke of said main piston, Whereby said main piston in its starting position will stand free from said auxiliary piston, but will abut against it in its intermediate position and its extreme end position, while said auxiliary piston has its foremost and rearmost positions respectively; a double acting valve having an intake and an exhaust port for pressure medium, conduits leading from said valve to the respective ends of said main cylinder, and a separate conduit leading from said valve to that end of the auxiliary cylinder which is situated away from said main cylinder; whereby on setting said valve in a certain position, the auxiliary piston will be made to travel against and shorten the stroke of the main piston, and, on setting said valve in another position, said auxiliary piston will be made to travel in advance of said main piston permitting a full stroke of the latter.

In testimony whereof I aiiix my signature in presence of two witnesses.

VICTOR REMBOLD. Witnesses:

ALBRECHT MiiLLER, CARL GRUNWALD.

Women of thlle patent may he ebtained fer five cent-e each, by addressing the "Commissioner at Watente,

Washington, D. 0." 

